在西部山区陡坡段桩柱式桥梁基桩应用非常广泛,而相关的设计计算方法比较落后.与平地上的桥梁基桩相比,陡坡段桩柱式桥梁基桩的承载状况更为复杂.根据陡坡段桩柱式桥梁基础的受力特点,建立了相应的简化受力模型,并以此为基础,导得了各特征桩段的挠曲变形微分方程及其内力与变形分析的幂级数解答.实际工程计算表明,本文计算方法与规范法吻合较好,最大误差不足10％,且能够考虑了基桩的P-△效应,设计偏于安全.在考虑滑坡推力作用的情况下,基桩内力与变形成倍增长,桩端未平衡弯矩较大.为确保施工安全及工后桥梁正常使用,必须对桥位处边坡进行局部的防护加固,以改善坡体与基桩的相互作用.%Bridge pile-columns are widely used in western mountain area, while the practical engineering design is fall behind. The mechanical behavior of the pile-columns is more complex than that of simple pile. According to the working characteristics of bridge pile-column, a simplified mechanical model is built to obtain the differential equation of the characteristic section of the pile a and then the power series method was applied to solve the equations. A practical projects and standard method calculation show a good agreement that the maximum error is less than 10% which takes the P-A effect into account. In consideration of the landslide thrust effect, the inner force and deformation of piles have multiplied. To ensure the safety of construction and use, it' s necessary to reinforce the slope where the bridge located to improve the pile-soil incorporation.
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